Sink assembly



FIG. 1 is a perspective view of a sink assembly showing our design;

FIG. 2 is a front elevation view;

FIG. 3 is a rear elevation view;

FIG. 4 is a side elevation view;

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view.

The broken-line disclosures in the view represents portions of the sink assembly in which the claimed design is embodied, but which forms no part of the claimed design. 

CLAIM The ornamental design for a sink assembly, as shown and described. 